Mistakes in Card Collecting

It's hard to make mistakes in card collecting.  I suppose you could overpay or overtrade for a card.  Maybe you prospect on a rookie player and he winds up being a bust so the cards don't go up in value like you'd hoped.  More common perhaps is buying or trading for a card you didn't know you already have.  I've done that for sure.  But none of those things are really that devastating to a collector who's in it just for the fun of it.

One of my biggest mistakes in collecting has to do with the Topps basketball sets from 2000-01 and 2001-02.  I found them at Rainbow, a LCS, for a really decent price.  The catch was, they didn't contain the draft pick rookies.  No big deal, I thought, at that price I can pick them up separately and still get a good deal.  Yeah, that's what I thought.  I figured Topps was Topps and their flagship cards would be in abundance.  Nope.  Fifteen years later, I still can't find some of them.  Those sets must of been severely short-printed or something.  Here's one I picked up on eBay recently.

This is the 2001-02 Topps of Kedrick Brown.  The search started way back then with 18 rookies needed for the 2000-01 set and 27 needed for the 2001-02 set.

I still need the following from 2000-01.  Any helpers out there?
#128 Marcus Fizer
#135 Jerome Moiso
#138 Mateen Cleaves
#145 Donnell Harvey
#148 Erick Barkley
#280 Hanno Mottola

I still need the following from 2001-02.  Help please!
#225 Jason Richardson
#242 Jeryl Sasser
#245 Samuel Dalembert
#248 Trenton Hassell